Let's just take it for granted that as a competitive game with multiple expansion develops it will have a meta of some kind. Some ships, upgrades or strategies are going to become more common than others and some ships, upgrades or strategies will be less common. New expansions may or may not shake things up, but they only will shake things up much if they can create a new "best" options for play.
Let me suggest a couple of things that I think a good meta would have. A wide meta. For example Flotillas are everywhere, but very few fleets are only made up of flotillas and those other parts are pretty varied. Same is true for Yavaris (at least where I play) but Yavaris is a whole fleet, and what people use to fill in the rest of their points is pretty varied. Something else you would like to see is a wide second tier, and hopefully close to the top tier in effectiveness. I have found that second best isn't chosen much more than options that are legitimately bad. Take the Defensive retrofit upgrade. I take ECMs almost always, it is one of them first upgrades I put on my ISDs. But there are other good upgrades for that slot, but I never take them because I am taking ECMs.
Additionally, player skill being equal (if such a thing can exist) you would expect a meta list to beat a non-meta list. But how much better of a player do you have to be in order to beat a first tier meta list with a list that is second tier. I think in a healthy meta player skill should be able to beat list.
This one is pretty obvious but we want our meta to play like a game of Rock/Paper/Scisors. Anti-fighter squadron lists beat bomber lists, minimal squadrons beat anti-fighter heavy lists. Bomber lists beat minimal fighter lists. This is an oversimplification, but you get the idea.
Finnally I think I would like a game complicated enough that what everyone is playing (or assume is the best) may not actually be the best. Sure there are some really really good list builders out there. And they are often the ones that define the meta. But in a game that is complex (like Armada) can you ever really be sure you have found what is best.
So what do you all think. What differentiates a healthy meta from an unhealthy meta, given the assumption that there will be a meta?
Does a healthy meta have to reward the use of the more iconic ships? Does a healthy meta have to reward play styles that are just more fun? I am not sure about those, but I am interested in hearing everyone else's opinion.